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並前往https://www.bram.us/2021/01/28/form-validation-you-want-notfocusinvalid-not-invalid/

Form Validation: You want :not(:focus):invalid, not - Bram.us

.error-message { display: none; } input:invalid { border-color: ... If you don't want any placeholder to show, set its value to (space).

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